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Dehaka lost his large right arm prior to the Swarm's return to Zerus[2]; it was later to be found in the same area where Sarah Kerrigan defeated the other primal pack leaders.[3]

When the Zerg Swarm returned to Zerus, Dehaka initially opted to simply observe the Swarm and Kerrigan. He witnessed the newcomers awaken Zurvan[4] and the primal-infestation of Kerrigan.[2]

Dehaka perceived Kerrigan as the strongest zerg. He and his pack welcomed the new power by allying with the Swarm, believing Kerrigan would lead them to new essence. Dehaka correctly predicted that the other pack leaders would refuse to similarly adapt[5][6]; the other pack leaders were destroyed by Kerrigan, including Zurvan.[3] Kerrigan confronted Dehaka afterwards, confirming that Dehaka had known that Zurvan would turn on her. He did not deny this—one zerg would grow strong, the other would fall. Dehaka remained with the Swarm.[5][7]

The Swarm arrived at Skygeirr Station, a Terran Dominion base. Dehaka was perplexed at the structure, but was nonetheless content, and eager to sample terran essence.[5][8] Essence of another kind existed within the base however, that of protoss-zerg hybrids. While their essence was strong, Dehaka could not collect it. He knew the beings' creator served Amon, a being that would "devour all essence." Dehaka believed that if Amon succeeded, all change would stop, and all essence would be collected. And he was willing to fight to prevent that from happening.[5][9]

The Swarm operated with Raynor's Raiders with the intent of retriving Jim Raynor from Dominion custody. Dehaka was disgruntled by the lack of essence to be found, and exchanged verbal barbs with Zagara. Kerrigan broke up the altercation, and forbid Dehaka from collecting essence in the area.[5][10] Raynor was successfully rescued,[11] but Dehaka noticed Kerrigan's silence afterwards.[5][12]

Kerrigan took the Swarm to Korhal, intent on deposing Emperor Arcturus Mengsk. Dehaka noted the abundance of essence on the world, and how different it was from essences he had encountered in the past. He and his pack would collect it.[5][13]

With the deployment of the Psi Destroyer, Dehaka and his pack were at an advantage, as they lacked the psionic connection that Swarm zerg shared. This made him immune to the Destroyer's effects, and he and his pack were able to sabotage its power links, allowing Kerrigan's zerg to destroy the device, giving the Swarm access to Augustgrad.[14] Soon afterward, Dehaka and his pack participated in the final attack on Korhal Palace.[15]